Here is the full list of all 16 Fetish Room 18+ achievements.
switch pose for 5 times
Earn Julian's trust
Satisfy Camelia for the first time
Satisfy Martha for the first time
Satisfy Julian for the first time
Earn Samantha's trust
upgrade skill for the first time
Get a grade of A
Satisfy Samantha for the first time
Get a grade of D
switch pose for 25 times
Earn Camelia's trust
Earn Martha's trust
upgrade all skills to the max
Sucessfully complete all sessions
Finish all sessions with an A rating